Querying non-existent ATA accounts is very slow

[mocco-hub]

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@IAliceBobI

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                     Issue Description 

Issue Description

When querying the balance of an ATA (Associated Token Account) that does not exist, the response is very slow.

Reproduction Steps

1. Use a new wallet address that has never held USDC
2. Query the USDC ATA balance for this address
3. Observe significant delay before response

Example Scenario

// Example code (pseudo-code)
const usdcMint = new PublicKey("EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v"); // USDC mint
const wallet = new Wallet("new-wallet-address-without-usdc-ata");

// This query is slow when ATA doesn't exist
const balance = await connection.getTokenAccountBalance(
getAssociatedTokenAddressSync(usdcMint, wallet.publicKey)
);

Expected Behavior

• Should return quickly with a "account not found" error or null balance
• Similar to how mainnet-beta handles non-existent accounts

Actual Behavior

• Significant delay (can take several seconds)
• Makes balance checking for new wallets very slow

Environment

• Surfpool version: [Please fill in]
• OS: [Please fill in]

Additional Context

This affects:

• Balance checking for new users
• Batch balance queries where some accounts don't exist
• Token portfolio displays for new wallets

The issue is particularly noticeable when:

• Querying multiple token balances for a new wallet
• Building portfolio displays where most ATAs don't exist yet

[github-actions]

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